Best HVAC Companies in Leonard, MI (2026)

In Leonard, One Hour Heating and Air Conditioning of NE Oakland County works on furnaces, air conditioners, heat pumps and ductwork. The company also handles indoor air quality and humidifiers, and its website mentions licensing and a satisfaction guarantee. Reviewers describe crews who arrive on time and answer questions clearly. One mentions a complex problem that was found and fixed before it turned into a bigger expense. Others describe a furnace install where the exhaust pipe and cold air return were custom bent to fit, with no mess left behind. If you want a furnace replaced or an air quality issue sorted, this is a local option.

Smither's Mechanical, also known as SMC Heating & Cooling, is in Leonard. Its website shares a change: after more than 40 years in the industry, Shawn is retiring, and SMC is partnering with Dynamic HVAC Michigan. The rebrand starts in 2026, and existing customers can still reach the team at the same number. Reviewers mention furnace and air conditioner installs, plus repairs on problems other companies could not solve. One describes a same-day visit on a cold morning, with the right part on the truck and heat restored in under an hour. Others mention honest advice, quick callbacks and good pricing.

Based in Orion Township, Randazzo Heating & Cooling serves Leonard from 10.1 miles away. Founded in 1988, the company works on furnaces, air conditioners, heat pumps, boilers and ductwork, and it also installs humidifiers and generators. Its website states it is licensed and insured, and it offers free estimates, a free second opinion and a maintenance plan. Reviewers mention crews who arrive on time, work steadily through the day and clean up before leaving. Several describe careful furnace and AC installs, with ducts, pipes and outdoor lines routed to look neat. One mentions the crew walking them through every feature of a new thermostat.

From Oxford, 6.7 miles away, family-owned Oakland Heating & Cooling serves Leonard. It has been operating since 2000 and offers furnace and AC repair, replacement, tune-ups and maintenance plans, along with indoor air quality, humidifier and water heater work. The website lists EPA certification, licensing and insurance, 24/7 service and free estimates. Reviewers mention fast response times and clear communication, including a text when the technician is on the way. One says the problem was pinpointed quickly and fixed without replacing the unit. Others describe technicians who are professional, respectful and clean, and who explain what is wrong before starting.

The Village of Clarkston is home base for Carter's Plumbing, Heating & Cooling of Clarkston, which serves Leonard from 12.5 miles away. Started in 2013, it handles furnace, cooling and humidifier installation, maintenance and repair, along with a full plumbing side: water heaters, tankless units, sump pumps, water softeners and drain clearing with camera inspection. The website states it is licensed and insured and offers a membership plan. Reviewers mention technicians who diagnose problems thoroughly and explain everything well. One describes the company working directly with an insurance company on a claim, and another mentions a Saturday sump pump repair.